7 **Taper** mesh quality criterion represents the ratio of the areas
8 of two triangles separated by a diagonal within a quadrilateral face.
12 **JA = 0.25 * (A1 + A2 + A3 + A4)**
13 **TAPER = MAX(|A1/JA - 1|, |A2/JA - 1|, |A3/JA - 1|, |A4/JA - 1|)**
15 *To apply the Taper quality criterion to your mesh:*
17 .. |img| image:: ../images/image36.png
19 #. Display your mesh in the viewer.
20 #. Choose **Controls > Face Controls > Taper** or click *"Taper"* button |img| in the toolbar.
23 Your mesh will be displayed in the viewer with its elements colored according to the applied mesh quality control criterion:
25 .. image:: ../images/image90.jpg
28 **See Also** a sample TUI Script of a :ref:`tui_taper` filter.